Lighting apparatus in sewing machines



ug- 1962 JUTA-RO SASAKI 3,049,612

LIGHTING APPARATUS IN SEWING MACHINES Filed June 29, 1959 2 Sheets-Sheet1 Mil/5N TOR our/mo snsmq 1962 JUTARO SASAKI 3,049,612

LIGHTING APPARATUS IN SEWING MACHINES Filed June 29, 1959 2 Sheets-Sheet2 7'- a: v (A 33 4", 24 nu A5 27 I INVENTOR JUTARO 3 SAKI r YUM/KM? 4wnited tates This invention relates to lighting apparatus in sewingmachines.

In a known type of sewing machine, in which an electric lamp is mountedin the lower part of a drum near a machine base parallel with thedirection of a machine head, that is, crosswise to .the direction ofsewing, sutficient light can not be given to the sewing part, for theeffective rays are only those coming from the head of the lamp in aslanting direction and those are disturbed by the sewers hand.Furthermore, a big casing for the lamp projecting firom the underside ofthe drum looks awkward.

The object of the present invention is to provide means to improveillumination in a sewing machine.

With this object in view, the present invention provides a lightingapparatus in a sewing machine, wherein at the lower part of a machinehead near a front plate is formed a recess, with a casing therein fittedin such a way as to leave a space for a heat radiating chamber, and anelectric lamp having a rotary switch is installed in the casingcrosswise to the direction of the machine head, that is, in parallelwith the direction of sewing.

According to the present invention, the lighting of the sewing part isgreatly improved, for a lamp, which is removably mounted parallel withthe direction of sewing and set in a casing fitted into a recess formedat the lower part of the machine head near the trout plate, casts allefiective rays down upon the sewing part, almost vertically and neverinterrupted by the sewers hand. In addtition, the lamp can becomparatively small, the mounting of a casing is easy, the switch iseasily turned on and oif by turning a knob and overheating of themachine head can be prevented by the radiator chamber formed therein.

Other and the further objects of the present invention will becomeapparent from the following. specification and claims taken togetherwith the accompanying drawings in which is shown the preferredembodiment of the lighting apparatus in a sewing machine according tothe present invention.

FIG. 1 is an elevation of a sewing machine embodying the presentinvention.

FIG. 2 is a sectional plan view taken on the line 22 of FIG. 1.

FIG. 3 is an enlarged sectional side View taken on the line 33 of FIG.1.

FIG. 4 is a sectional elevation taken on the line 4-4 of FIG. 3, and

FIG. 5 is a sectional elevation taken on the line 55 of a socket ofwhich the cap is removed.

In these drawings reference numeral 11 indicates a machine head, at thelower part of which a recess 12 is formed near a front plate 13. Intothe recess 12 is inserted a plastic casing 14 having a semicylindricalform, provided with front and rear portions 15 and 16, of which the fromposition 15 is fixed to the machine head 11 by a set screw 17. A socket18 having therein a threaded receptacle for an electric lamp '19 isremovably fitted in an opening made at the rear portion 16 so that theelectric lamp 19 may be passed through the opening 20 and located in thecasing 14 transverse to the direc- 3,049,612 Patented Aug. 14, 1962 tionof the machine head 11. Between the machine head 11 and the casing 14,which casing is provided with a reflecting plate 21, is formed a heatradiating chamber 22 having ventilation openings 23 to prevent themachine head 11 from overheating due to the heat of the electric lamp19.

On a shaft 24 of a knob 25 is mounted a ratchet wheel 26 made ofinsulating material, provided with four arms 27, of which the alternatetwo are covered with metallic pieces 28 electrically connected with aspring contact piece 29 through flanges 30a on rivet 30 and throughwasher 30b. The inner ends of metallic pieces 28 wipe on washer 39b. Aterminal 31 is electrically connected with the threaded receptacle 32,and terminal 34 is connected with spring 33. When the metallic pieces 28come in contact with the spring 33, the electric circuit of the lamp 19is closed from terminal 31 to terminal 34.

Power is supplied to terminals 31 and 34 through two prongs 35frictionally fitting into sleeves 36, which sleeves are in turnconnected to a source of power by wires (not shown) extending alonggrooves 37 in the top of semicylindrical casing 14 and through theopening 32 in the head 11. Thus the entire socket 18 can be easily andquickly unplugged from the casing 14 to change the lamp 19.

It is thought that the invent-ion and its advantages will be understoodfrom the foregoing description and it is apparent that various changesmay be made in the forms, construction and arrangement of the partswithout departing from the spirit and scope of the invention orsactrificing its material advantages, the form hereinbefore describedand illustrated in the drawings being merely a preferred embodimentthereof.

Having thus described my invention, what I claim and desire to secure byLetters Patent of the United States is:

1. In combination, a sewing machine head extending longitudinally of asewing machine, said head having a downwardly opening semicylindricalrecess adjacent the end thereof, said recess extending transversely ofthe longitudinal direction of said head, one end of said recess openingout of one side of said head, said head having a semicircular groovetherein around the inside of said recess, a semicylindrical casingfitted into said semicylindrical recess, said casing having a closed endsecured to said head at the closed end of said semicylindrical recess,the other end of said casing having an opening therethrcugh, saidsemicylindrical casing having a semicylindrical wall defining with saidsemicircular groove a ventilating chamber extending in a semicirclearound said semicylindrical casing and opening out of said head at thesides of said semicylindrioal casing, said semicylindrical wall havingat least one aperture therethrough opening into said ventilatingchamber, a light socket removably fitted into said opening in the otherend of said casing and having switch means thereon, and currentconducting means on said socket and current conducting means on saidsemicylindrical casing engageable with each other.

2. The combination as claimed in claim 1 in which said socket comprisesa threaded receptacle for a light bulb, a socket body having a recesstherein in which said threaded receptacle is mounted, said socket bodybeing the portion of the light socket which is removably fitted in saidopening, and said means on said socket for placing it in electricalconnection with said casing comprise a pair of prongs on said socketbody, one in electrical connection with said threaded receptacle and theother in electrical connection with said switch means, said switch meansbeing in electrical connection with said threaded recepta- ReferencesCiied in the file of this patent UNITED STATES PATENTS 'Cha-son Dec. 23,1930 Hohmann Nov. *1 8, 19'47 Langille Dec. 12, 1950 Singer et al May27, 1952 Q wan .h, F

